OpenSCAD header

//--------------------------------
// {Project Name}
// {Creator Name}
// CC {Year}
// OpenSCAD
//--------------------------------

// Thingiverse Customizer Docs: http://customizer.makerbot.com/docs

// OpenSCAD uses millimeters (mm) for units.
// Distance functions are both for conversion and to state plainly that a number is a
//    distance measurement, not just a value.
// Fractions are interpreted as formulas: '1 3/4' = '1+3/4' = 1.75
function mm(x = 1)     = x *    1.00000;
function cm(x = 1)     = x *   10.00000;
function m(x = 1)      = x * 1000.00000;
function inches(x = 1) = x *   25.40000;
function feet(x = 1)   = x *   25.40000 * 12;
function yards(x = 1)  = x *   25.40000 * 12 * 3;

function twice(x = 1)  = x *    2.00000;
function half(x = 1)   = x *    0.50000;

// Segments used for circles/cylinders have their *endpoints* on the radius.  This means that
//    cylinders used for holes will be too small; the *midpoints* need to be on the radius,
//    not the *endpoints*.  This function returns properly sized radii for holes.
function midpoint_radius (endpoint_radius, num_facets) = endpoint_radius / cos(360/(num_facets*2));

// OpenSCAD uses degrees (deg) for units.
// Angle functions are both for conversion and to state plainly that a number is a
//    angle measurement, not just a value.
_pi   = 3.14159265359 * 1.0;  // (Made into an equation so that Customizer won't pick it up.)

function deg(x = 1) = x;
function rad(x = 1) = x * (180 / _pi);

// Creates a vector that points from the origin to a specific point in space.
function rotateto(x=1,y=1,z=1) = [0,acos(z/norm([x,y,z])),atan2(y,x)];

// Sets different curve smoothnesses for draft <F5> and render <F6> views
draft_quality = 12; // [12:6:360]
final_quality = 72; // [12:6:360]
smoothness =$preview ? draft_quality : final_quality; // (Circles are divided in $fn line segments.)
// echo($preview,smoothness);
$fn = smoothness;

//--------------------------------------------------------------------------------------------
/*/
//*/
;